论文标题
活性极环聚合物的动力学
Dynamics of Active Polar Ring Polymers
论文作者
论文摘要
分析研究了分离的半融合活性极性环聚合物的构象和动力学特性。将一个环建模为暴露于切向活性力的连续高斯聚合物。线性非热运动方程的分析解决方案根据特征功能的扩展，表明环构象与活性无关。相比之下，活动强烈影响内部环动力学，并产生特征时间状态，而被动环中不存在。在中间时间尺度上，柔性环显示出活性增强的扩散状态，而半融合环则表现出弹道运动。此外，第二个主动时间机制在更长的时间尺度上出现，其中环显示出类似蛇的运动，这让人联想到剪切流中的坦克式旋转动力学，并由最长的放松时间以最长的模式主导。
The conformational and dynamical properties of isolated semiflexible active polar ring polymers are investigated analytically. A ring is modeled as continuous Gaussian polymer exposed to tangential active forces. The analytical solution of the linear non-Hermitian equation of motion in terms of an eigenfunction expansion shows that ring conformations are independent of activity. In contrast, activity strongly affects the internal ring dynamics and yields characteristic time regimes, which are absent in passive rings. On intermediate time scales, flexible rings show an activity-enhanced diffusive regime, while semiflexible rings exhibit ballistic motion. Moreover, a second active time regime emerges on longer time scales, where rings display a snake-like motion, which is reminiscent to a tank-treading rotational dynamics in shear flow, dominated by the mode with the longest relaxation time.
